glycosaminoglycan
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https://doi.org/10.1351/goldbook.G02659
The carbohydrate units in proteoglycans are polysaccharides that contain amino sugars; these polysaccharides are known as glycosaminoglycans.
Source:
White Book, 2
nd
ed., p. 85 (https://iupac.qmul.ac.uk/bibliog/white.html)